Study on conductivity and redox stability of iron orthovanadate

Peter I. Cowin, Rong Lan, Lei Zhang, C. T G Petit, Arno Kraft, Shanwen Tao

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

FeVO4 was synthesised by conventional solid state technique. Impedance measurements using a silver electrode were unsuccessful due to a solid state reaction between FeVO4 and Ag, forming a-AgVO 3 and a-Fe2O3 at the interface. Impedance measurements, with a platinum electrode, reaffirmed that FeVO4 exhibits semiconductor behaviour in air. In a reducing atmosphere, 5% H 2/Ar, high electronic conductivity, from 1 S cm-1 at 300 °C to 2 S cm-1 at 700 °C, was observed with an activation energy of 0.13(1) eV. X-ray diffraction, thermogravimetric analysis and differential scanning calorimetry data determined that the change in electronic conductivity was due to the degradation of the material into FeV 2O4 and a-Fe2O3. It is believed that the conduction was due to electron hopping between vanadium d-orbitals. Neither FeVO4 nor FeV2O4 are deemed suitable as anode materials for solid oxide fuel cells, due to redox instability. © 2010 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)614-618
Number of pages5
JournalMaterials Chemistry and Physics
Volume126
Issue number3
DOIs
Publication statusPublished - 15 Apr 2011

Keywords

  • Ceramics
  • Electronic materials
  • Inorganic compounds
  • Oxide
  • Powder diffraction

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